Freezing Fog Advisory issued December 2 at 4:44PM PST until December 3 at 11:00AM PST by NWS Portland OR

* WHAT…For the Freezing Fog Advisory, visibility one quarter mile
or less in areas of dense freezing fog. For the Air Stagnation
Advisory, light winds and limited air movement will lead to a
period of stagnant air conditions. This scenario could result in
the build up of air pollutants over time.

* WHERE…South Willamette Valley, and East Central Willamette
Valley.

* WHEN…For the Freezing Fog Advisory, until 11 AM PST Tuesday. For
the Air Stagnation Advisory, until 4 AM PST Thursday.

* IMPACTS…Deteriorating air quality may cause issues for people
with respiratory problems. Low visibility in areas of dense
freezing fog could make driving conditions hazardous.

* ADDITIONAL DETAILS…Dense fog will impact portions of the I-5
corridor from Salem to Eugene. Frost is possible on elevated
surfaces and grassy surfaces, as well as bridges and overpasses.